/*
 * Copyright (C) 2011-2019 Project SkyFire <http://www.projectskyfire.org/>
 * Copyright (C) 2008-2019 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2019 MaNGOS <https://getmangos.com/>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 3 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef SKYFIRE_PATH_H
#define SKYFIRE_PATH_H

#include "Common.h"

#include <vector>
#include <deque>

struct PathNode
{
    PathNode(): x(0.0f), y(0.0f), z(0.0f) { }
    PathNode(float _x, float _y, float _z): x(_x), y(_y), z(_z) { }
    float x, y, z;
};
template<typename PathElem, typename PathNode = PathElem>

class Path
{
public:
    size_t size() const { return i_nodes.size(); }
    bool empty() const { return i_nodes.empty(); }
    void resize(unsigned int sz) { i_nodes.resize(sz); }
    void crop(unsigned int start, unsigned int end)
    {
        while(start && !i_nodes.empty())
        {
            i_nodes.pop_front();
            --start;
        }

        while(end && !i_nodes.empty())
        {
            i_nodes.pop_back();
            --end;
        }
    }
    void clear() { i_nodes.clear(); }

    float GetTotalLength(uint32 start, uint32 end) const
    {
        float len = 0.0f;
        for (uint32 idx=start+1; idx < end; ++idx)
        {
            PathNode const& node = i_nodes[idx];
            PathNode const& prev = i_nodes[idx-1];
            float xd = node.x - prev.x;
            float yd = node.y - prev.y;
            float zd = node.z - prev.z;
            len += sqrtf(xd*xd + yd*yd + zd*zd);
        }
        return len;
    }

    float GetTotalLength() const { return GetTotalLength(0,size()); }

    float GetPassedLength(uint32 curnode, float x, float y, float z)
    {
        float len = GetTotalLength(0,curnode);

        if (curnode > 0)
        {
            PathNode const& node = i_nodes[curnode-1];
            float xd = x - node.x;
            float yd = y - node.y;
            float zd = z - node.z;
            len += sqrtf(xd*xd + yd*yd + zd*zd);
        }

        return len;
    }

    PathNode& operator[](size_t idx) { return i_nodes[idx]; }
    PathNode const& operator[](size_t idx) const { return i_nodes[idx]; }

    void set(size_t idx, PathElem elem) { i_nodes[idx] = elem; }

protected:
    std::deque<PathElem> i_nodes;
};

typedef Path<PathNode> PointPath;

#endif
